I'm implementing a WebDAV file server using the ITHit WebDave engine, i have the following problem
When i list the files and open one of them i get the ReadAsync method called, i provide the content and the file is opened correctly
However any changes i make to the file can't be saved, i get an error saying
A device attached to the system is not working
I looked at the file system samples and implemented support based on the FileSystemStorage.AspNetCore sample,
From what can understand the WriteAsync method is used when creating new files, should i expect for WriteAsync to also be called for file edits that need to be changed?
Am i wrong in the assumption that DavFile.WriteAsync will be called with a stream for the updated content?
If WriteAsync is not the right location to save updates to a file, could you provide some guidance on the process of saving changes to existing files?
Edited to add:
Now i can see that after i dismiss the first error about the device not working i get the standard save dialog box, if i click save it asks me if i want to overwrite the existing file, after accepting to overwrite then WriteAsync is called and i can update the file contents
I'm not quite sure why it would first tell me there's an error and then still allow me to write the file but only as replacement to the original file
Thanks for your help
Fixed, i found that there were issues with the ILockAsync implementation, reviewing the FileSystemStorage sample helped fix the issue with locking files before writing or updating properties
Related
This application always create a file when you activate a function (lets say, a log file). This file cannot be opened during the running - but I need its content before application closes (another process uses it, so I cant even view it). Is there a way to "hook" it somehow?
Im working with Delphi, but I accept any other solution.
So, summary, I need to know what file application created (it always creates other, but in the same directory) and the content it wrote. Any help appreciated.
I found a workaround:
copy the file, and operate on the cloned one:
http://www.howtogeek.com/howto/windows-vista/backupcopy-files-that-are-in-use-or-locked-in-windows/
During part of a request in a Rails application, I copy a directory from one place to another, think of it like a working area. Sometimes this copy operation results in "Errno::ETXTBSY" exceptions being thrown. I can't seem to pin down the case that causes it, any tips to detect the case or avoid it altogether?
I've made sure the destination directory is uniquely named, so it shouldn't be a case of 2 processes attempting to write to the same place. Beyond that I'm out of ideas.
ETXTBSY means that you're trying to open for writing a file which is currently being executed as a program, or that you're trying to execute a file which is currently open for writing. Since you say you're copying files, not executing them it seems likely it's the former, not the later.
You say you're targeting a unique new destination, but my guess is that's not entirely true and you're actually targeting an existing directory and one of the files you're attempting to overwrite is currently open as an executable text segment of a running process.
You haven't posted any code, so it's hard to comment specifically. I suggest you add enough logging so you know exactly what file(s) are being processed and specifically, the source and destination path that throws the exception. Then you could use lsof to see what process may have that file open.
One way to avoid the problem if you are overwriting a currently open executable, is to first unlink the target file. The running process will still have the old inode mapped and proceed merrily using the deleted file, but your open for write will then create a new file which won't conflict.
I have used paperclip to allow me to upload files to a rails application. Everything works and the file is uploaded, but instead of seeing a link to the actual file itself I see the location of it within the systems folder of the rails project.
I'm guessing its either a routing issue or I need to create a link to the file in question. However, I would like to hide the location of the file itself, and only see the link displayed.
I would be very grateful if someone could point me in the right direction here.
You want to hide the actual path of the file in the server, right?
You can achieve that using send_file (http://api.rubyonrails.org/classes/ActionController/DataStreaming.html#method-i-send_file) in a normal controller.
You will still need to do something to protect the download using the real path.
I have a SQlite database file with records which comes with my app.
I just used the file I added to my project to make my INSERT and UPDATE statements.
After uploading it to my test device I got the exception that the file is read only.
After a bit of research I found out, that I have to copy the db file to the users directory to make an insert. This works for now. But I have a view questions about it, which i didn't get answered through google:
Where should I put my copy process?
I implemented it in the AppDelegates FinishedLaunching, where I check if it already exists.
Where should I copy the file to?
I used the MyDocuments folder for now, is this ok?
Since the file cannot be encrypted, can another app access the database file?
When the user decides to delete the app from the device. Will the database file get deleted,too?
Thanks!
Where should I put my copy process? I implemented it in the AppDelegates FinishedLaunching, where I check if it already exists.
That really depends, but finishedLaunching is OK from my point of view.
Where should I copy the file to? I used the MyDocuments folder for now, is this ok?
I'm not sure what you mean by "MyDocuments" folder. Each Application has a dedicated Document directory. That's where you should copy it.
Since the file cannot be encrypted, can another app access the database file?
No, they run sand-boxed (unless the device is jailbroken)
When the user decides to delete the app from the device. Will the database file get deleted,too?
Yes, since the whole document directory will be deleted.
Where should I put my copy process? I implemented it in the AppDelegates FinishedLaunching
Keep in mind that you have a limited amount of time to complete FinishedLaunching execution (around 15 seconds) before the iOS watchdog kills your application.
Depending on the size of your database, the speed of device and other processing you need to do then you might want to consider only checking if it already exists (that should be quick) then do the copy (if required) from to another thread.
I used the MyDocuments folder for now, is this ok?
Yes, using Environment.GetFolderPath (Environment.SpecialFolder.MyDocuments) is correct.
Everything else from #Lightforce answer covers the rest.
I'm building a Reporting web application right now with MVC3 and I've come up to a couple problems.
My goal is to have it able to generate and view Crystal Reports, SSRS reports, and Excel documents.
Right now I'm working on the Excel segment and I'm running into more trouble than I thought I would. First off, when I link directly to the file, it either opens inside the browser or it downloads it from the server and if the user makes changes it doesn't actually save it to the true file on the server.
I've tried both linking to the file directly using Razor and a ViewModel with the path to the document as well as directing it to an action that returned a File.
I've also tried linking it to a shortcut to the actual file thinking that if I could open the shortcut it would open the file the way I wanted it to and unfortunately it didn't really open at all.
The users already have access to the files on the server through a network drive, so as of right now they can go into the server, open the excel document, edit and save it no problem. I want to duplicate this effect through a link. The program already has a file browser built, so I can browse between the files and make links to the reports.
Thanks in advance!
Since they are apparently on a network drive, you can just link to the files directly, relative to the user?
For example: a link to file://///SERVERNAME/folder/
I tested it between two computers on the network, and that seems to work. However, you still get a popup asking that you want to do with the file, open or save. (both in firefox and IE)
Note: Yes, that many slashes seem necessary, lol